338 ARC – 285 gr FMJ – Frontier (FR430) – 200 Rounds

Subsonic practice ammo keeps a suppressed 338 ARC fun to shoot without burning through hunting loads. This listing is Frontier 338 ARC 285 grain full metal jacket subsonic ammo, MPN FR430, sold as a 200 round bulk case. Frontier Cartridge is Hornady’s range and training line.

The 285 grain FMJ is a non-expanding target bullet loaded to subsonic velocity. Frontier lists this load at 1,050 fps with 698 ft-lbs of muzzle energy, roughly 75 fps below the speed of sound, which keeps it quiet through a suppressor. That makes it a cost-effective way to practice with the same point of impact and feel as heavier subsonic hunting loads.

The 338 ARC (Advanced Rifle Cartridge) is a newer Hornady cartridge built for the AR-15 platform and standardized by SAAMI in 2025. It fits a standard AR-15 lower with a 338 ARC barrel, a bolt and magazines made for the ARC case family. A common question is whether 338 ARC is interchangeable with 300 Blackout. It is not: the two use different cases and bullet diameters, so only fire this ammo in a firearm marked 338 ARC. The cartridge was designed around suppressor use, and Hornady offers it in both supersonic and subsonic loadings. Its .338 inch bullets range from lighter supersonic hunting loads to heavy subsonic projectiles, so one rifle can cover deer and hog hunting at moderate range as well as quiet suppressed shooting. FMJ bullets do not expand, so this is a range and training load. Subsonic ammo may need a suppressor or adjustable gas to cycle, so test in your rifle.

Frontier Cartridge FR430 is new production ammunition, not reloads, made in the USA. Each cartridge uses a brass case with a boxer primer and is non-corrosive, and the boxer primed brass is reloadable for handloaders. Buying by the case also keeps you on one production lot, so point of impact and velocity stay consistent from box to box. This case comes in factory packaging as 10 boxes of 20 rounds for a total of 200 rounds of 338 ARC 285 grain Full Metal Jacket (FMJ), Subsonic.